Gravesande, Willem Jacob 's, Physices elementa mathematica, experimentis confirmata sive introductio ad philosophiam Newtonianam; Tom. 1

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[341.] Experimentum 3.
[342.] Experimentum 4.
[343.] SCHOLIUM, Demonſtrationes n. 914. & 915.
[344.] F f, F g :: FC aut IH, FH
[345.] CAPUT XII. De Retardatione Corporum in Fluidis motorum.
[346.] Machina, Qua Experimenta de Pendulorum Retardationibus inſtituuntur.
[347.] Experimentum.
[348.] SCHOLIUM 1. De Logarithmica.
[349.] Definitio 1.
[350.] Definitio 2.
[351.] AC, HI :: LM, RS ; & dividendo
[352.] TC, VM:: AC, LM.
[353.] C c, c E:: CA, AT, & M m, m O :: ML, LV.
[354.] SCHOLIUM 2. De Retardatione in genere.
[355.] SCHOLIUM 3. De Retardatione ex prima Cauſa.
[356.] SCHOLIUM 4. De Retardatione ex ſecunda Cauſâ.
[357.] SCHOLIUM 5. De ambabus Retardationibus conjunctim.
[358.] B Iq - PRq, PRq :: AI-AB = BI, AB.
[359.] SCHOLIUM. 6 De Corporibus in altum projectis.
[360.] SCHOLIUM. 7. De Corporibus in Fluidis cadentibus.
[361.] f L, k M :: {E e/FE}, {Ii/KI} :: {CD/FE} = {BA/FE} -{BE/FE}, {GH/KI} = {BA/KI} - {BI/KI}
[362.] fL, kM :: {BA/FE}-{FE/BA}, {BA/KI} = {KI/BA}
[363.] SCHOLIUM 8. Illuſtratio quorundam quæ ad retardationem ſpectant.
[364.] LIBRI II. Pars III. De Aëre, & aliis Fluidis Elaſticis. CAPUT XIII. Aërem Fluidorum proprietates habere.
[365.] Definitio 1.
[366.] Definitio 2.
[367.] Experimentum 1.
[368.] Experimentum 2.
[369.] Experimentum 3.
[370.] Experimentum 4.
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397265MATHEMATICA. LIB. II. CAP. XI.11911.22
Velocitates # Reſiſtentiæ globi H. # Reſiſtentiæ globi G in exp. I.
1 # {3/4} + # {3/4} - 2 # 2 {3/4} # 1 {1/2} - 3 # 6 -- # 3 -- 4 # 9 {3/4} + # 4 {3/4} 5 # 15 {1/4} # 7 {3/4} 6 # 21 # 10 {1/2} 7 # 28 #
Reſiſtentiæ in minori velocitate ſolæ ſunt quæ cum propo-
ſitione non congruunt;
ſed jam in experimento præcedenti
vidimus illam corrigendam eſſe, quæ in illo experimento
fuit detecta;
reſiſtentia verò ibi in regulari ſerie poſita,
dimidium eſt illius, quæ, in eadem velocitate, in hoc ulti-
mo experimento, fuit determinata.
Reſiſtentia ex prima cauſa non mutatur pro diverſa cor-
33912. poris figura, ſi modo cavitas formata in motu eadem ſit ;
44893 464. quare in cono & cylindro juxta axeos directionem motis,
ut &
in globo, ſi horum corporum diametri fuerint æqua-
les, &
agatur de eodem fluido, & eadem velocitate, re-
ſiſtentia eadem eſt.
Reſiſtentia autem ex ſecunda cauſa variat pro diverſa
55913. corporis figura;
nam licet ſluidum quieſcens quaqua ver ſum æ-
quali vi premat, hoc ad preſſionem ex motu oriundam non
debere referri facile patet, quæ juxta unicam tantum dire-
ctionem agit, &
non tota ſuſtinetur niſi a plano ad hanc di-
ctionem perpendiculari.
Demonſtramus in ſcholio ſequenti reſiſtentiam cylindri
66914. ſe babere ad coni reſiſtentiam, ſi ambo fuerint recti, &
eâ-
dem velocitate, juxta axium directiones, in eodem fluido, mo-
ti, ut linea in coni ſuperficie, à vertice ad punctum quod-
cunque baſeos ducta, ad ſemidiametrum baſeos.
Cylindri autem recti & globi reſiſtentias eſſe inter ſe ut
77915. tria ad duo, ſi diametri fuerint æquales, &
ille juxta

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